TRIBE III. MADREPORACEA. 493 



sum, caliculis subtubiformibus, scepe angulatis, |'" latis, brevibus sen 

 obsolescentibus, confertis; cellis \2-radiatis. 



Glomerate, subgibbous, with a thick revolute margin. Corallum 

 porous ; calicles subtubiform, often angular, crowded, |- of a line 

 broad, very short or obsolescent ; cells 12-rayed. 



Plate 44, fig. 1, corallum, natural size. 



Feejee Islands. Exp. Exp. 



One specimen obtained at the Feejees, measures four inches by three 

 in breadth, and was attached at centre by a short pedicel. Its thick- 

 ness is about two inches at centre and half an inch at the margin; 

 the margin appears as if folded under, and contains immersed cells 

 below for half an inch. The length of the calicles above is scarcely 

 half their breadth : they are much crowded arid angular, and give 

 an uneven surface to the corallum. 



II. Caliculis nullis, coralli superficie spinuloso-asperd. 

 a. Laxe foliacece aut subramosce. 



4. MANOPORA PALMATA. (Dana.} 



M. pumila, ramosa, scepe irregulariter palmata, ramis valde compressis, 

 raro subteretibus et stride digitalis, 2-3'" crassis; polypis pallide 

 brunnescentibus, disco maculatis; tentaculis complanatis, alternis cceru- 

 lescentibus, aliis brunnescentibus, macula pallida prope apicem. Co- 

 rallum fragile, papilloso-asperatum ; cellis numerosis, 6-12-radiatis. 



Small; ramose, often irregularly palmate, branches much compressed, 

 rarely terete and close digitate, two to three lines thick ; polyps of 

 a pale brown colour, with the disk spotted, tentacles flattened, the 

 alternate pale bluish or lilac, the others pale brown, with a whitish 

 spot on the upper surface near the apex. Corallum fragile, papil- 

 loso-asperate, cells numerous, 6 to 12-rayed. 



Plate 44, fig. 2, flabellate variety, natural size; 2 b, polyp, enlarged ; 

 2 c, cells, showing also the surface, magnified 12 diameters ; 2 d, sur- 

 face of corallum, natural size ; 2 e, transverse section of a branch mag- 



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